package com.ogj.gulimall.product.service.impl;

import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.ogj.common.utils.PageUtils;
import com.ogj.common.utils.Query;

import com.ogj.gulimall.product.dao.CategoryDao;
import com.ogj.gulimall.product.entity.CategoryEntity;
import com.ogj.gulimall.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
//        1、查出所有分类
        List<CategoryEntity> selectList = baseMapper.selectList(null);
//        2、组装成父子的树形结构
//         （1）  所有 一级分类：
        List<CategoryEntity> collect = selectList.stream().filter((categoryEntity -> categoryEntity.getParentCid() == 0
        )).map((menu)->{
            menu.setChildren(getChildrens(menu,selectList));
            return menu;
        }).sorted((menu1,menu2)->{
            return (menu1.getSort()==null?0:menu1.getSort()) - (menu2.getSort()==null?0:menu2.getSort());
        }).collect(Collectors.toList());

        return selectList;
    }

    @Override
    public void removeMenuByIds(List<Long> asList) {
//      TODO  1、检查这些菜单是否被引用

//        批量删除
        baseMapper.deleteBatchIds(asList);
    }

    private List<CategoryEntity> getChildrens(CategoryEntity root,List<CategoryEntity> all){
        List<CategoryEntity> children = all.stream().filter(categoryEntity -> {
            return categoryEntity.getParentCid() == root.getCatId();
        }).map(categoryEntity ->{
//            1、 找到子菜单
            categoryEntity.setChildren(getChildrens(categoryEntity,all));
            return categoryEntity;
        }).sorted((menu1,menu2)->{
//            2、菜单的排序
            return (menu1.getSort()==null?0:menu1.getSort()) - (menu2.getSort()==null?0:menu2.getSort());
        }).collect(Collectors.toList());

        return children;
    }

}